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High-Resolution X-Ray CT Scanning Reveals the First Resin-Embedded Miniature Gecko of the Ge ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Bonn zoological Bulletin - früher Bonner Zoologische Beiträge. Jahr/Year: 2018 Band/Volume: 67 Autor(en)/Author(s): Daza Juan D., Hunziker Jordan P., Bauer Aaron M., Wagner Philipp, Böhme Wolfgang Artikel/Article: Things are not always as they seem: High-resolution X-ray CT scanning reveals the first resin-embedded miniature gecko of the genus Ebenavia 71-77 © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at Bonn zoological Bulletin 67 (2): 71–77 ISSN 2190–7307 2018 · Daza J.D. et al. http://www.zoologicalbulletin.de https://doi.org/10.20363/BZB-2018.67.2.071 Scientific note urn:lsid:zoobank.org:pub:AA5B7777-C36B-4E9C-B77E-272FBCBA3D7A Things are not always as they seem: High-resolution X-ray CT scanning reveals the first resin-embedded miniature gecko of the genus Ebenavia Juan D. Daza*, 1, Jordan P. Hunziker1, Aaron M. Bauer2, Philipp Wagner2, 3, Wolfgang Böhme4 1 Department of Biological Sciences, Sam Houston State University, 2000 Avenue I, Life Sciences Building, Room 105, Huntsville, TX 77341, USA 2 Department of Biology, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085, USA 3 Allwetterzoo Münster, Sentruper Str. 315, D-48161 Münster, Germany 4 Zoologisches Forschungsmuseum A. Koenig, Adenauerallee 160, D-53113 Bonn, Germany * Corresponding author: E-mail: [email protected] 1 urn:lsid:zoobank.org:author:7F796C4B-B0D5-4669-8D6F-96CA494B62F5 2 urn:lsid:zoobank.org:author:A54A16B8-BEE1-4996-9170-6CADB539B5D1 3 urn:lsid:zoobank.org:author:0575CE45-AB5C-4493-A8AD-DD399E18284A 4 urn:lsid:zoobank.org:author:FFAC2972-9F52-404B-BA9C-489C7793FF8D * urn:lsid:zoobank.org:author:78BB0EB0-8A48-4A1D-8D53-287AD1EF5FFA Abstract. We identify a presumed specimen of Sphaerodactylus in amber from the Zoological Research Museum Alexan- der Koenig as being embedded in copal, rather than amber. Further, the specimen matches the morphology not of a Hispa- niolan gecko, but of the extant Madagascan species Ebenavia boettgeri, which occurs in a known area of copal deposits. Key words. Sphaerodactylus, Ebenavia, CT scan, Madagascar, Osteology. Fossil lizards embedded in amber are frequently spec- (1998). The genera Phelsuma, Lygodactylus, and Gecko- tacular since they preserve, in high definition, the three lepis have been preserved in Madagascan copal. dimensionality of ancient organisms. To date, fossil re- The study of lizards in amber has been facilitated mains of squamates have been found in six amber de- by the use of X-rays and High-Resolution X-ray com- posits around the world (Daza et al., 2016). Examples puted tomography (HRCT; Polcyn et al., 2002; Daza et include the oldest reptile in amber (Baabdasaurus xe- al., 2013; Castañeda et al., 2014; Sherratt et al., 2015; nurus) from the Early Cretaceous of Lebanon (Arnold et Daza et al., 2016), allowing the rendering of the skele- al., 2002); some scales attributable to a squamate from ton without distortion, in addition to providing incredi- the Albian of France (Perrichot and Néraudeau, 2005); ble integumentary detail. As part of an ongoing research 14 fossil squamates from the mid-Cretaceous of Myan- project, we examined all available gecko specimens in mar, including members with affinities to Iguania, Gek- Miocene amber from Hispaniola preserved in amber us- kota, Scincoidea, Anguimorpha, and Ophidia (Arnold & ing HRCT. One specimen was revealed to be neither a Poinar, 2008; Daza et al., 2016; Fontanarrosa et al., 2018; Sphaerodactylus nor embedded in Miocene amber. The Daza et al., in press; Xing et al., 2018); a gekkotan and specimen was scanned at the Center for Nanoscale Sys- numerous lacertids in Baltic amber (Succinilacerta suc- tems, Harvard University using a Nikon (Metris) X-Tek cinea, Böhme & Weitschat, 1998; Borsuk-Białynicka et HMXST 225 scanner with a molybdenum target at 70kV, al., 1999; Yantarogekko balticus, Bauer et al., 2005; see 135 μA, 1000 ms exposure, 3143 projections, 0.1° rota- also Černaňský & Augé, 2013); and many lizards from tion step, and no filter. The reconstructed voxel size for the Miocene deposits of Mexico and Hispaniola classified the particular specimen was 14.251 μm. The original data in the genus Anolis (A. electrum, Lazell, 1965; Rieppel, set has been archived and is available to the public at Mor- 1980; de Queiroz et al., 1998; Polcyn et al., 2002; Castañe- phosource (https://www.morphosource.org/Detail/ProjectDetail/ da et al., 2014; Sherratt et al., 2015) and Sphaerodactylus Show/project_id/545). Additional specimens for compar- (S. dommeli, Böhme, 1984; S. ciguapa, Daza & Bauer, ison were scanned at UTCT | The University of Texas 2012). Copal specimens have received relatively less High-Resolution CT Facility in a Xradia – Zeiss ma- attention and were reviewed in Broschinski & Kohring chine. The specimens were scanned with a 4X objective, Received: 04.07.2018 Corresponding editor: R. Peters Accepted: 13.09.2018 Published: 01.11.2018 © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at 72 Juan D. Daza et al. Fig. 1. Specimen ZFMK 94000, in dorsal view. Scale bar equals 5 mm. 70kV/10W using variable parameters. These specimens performed using Avizo Lite 9.5.0 (© FEI SAS, Thermo are part of a large data base of skull Micro-CT that in- Fisher Scientific, 2018). cludes nearly all gekkotan genera (Aaron M. Bauer digi- The specimen in question, from the Alexander Koe- tal collection). All post- processing of the scan data was nig Research Museum (ZFMK 94000, Fig. 1), had been obtained by the museum sponsoring society (Alexan- der-Koenig-Gesellschaft) in November 2012 under the assumption that it was a piece of Dominican amber with a Sphaerodactylus (Gekkota: Sphaerodactylidae) inclu- sion. Although the size and overall appearance is con- sistent with that of these miniaturized geckos (Daza et al. 2008), a more thorough analysis of this material and comparison with the Micro-CT data base of gekkotans indicated that this specimen is a Madagascan clawless gecko of the genus Ebenavia in the family Gekkonidae. Morphological data indicates that the specimen is a sub- fossil, and that the resin is copal, not amber. Copal from Madagascar is botanically assigned to the fabacean species Hymenaea verrucosa (Penney et al., 2005). Copal can be differentiated from mature res- ins, such as amber, with Raman spectroscopic analyses, showing more intense bands at around 1640 cm−1 due to more stretching vibrations of the v(C=C) attributed to the olefinic group (C=CH2; Winkler et al., 2001). Thermal analyses have also been used to characterize resins; co- pal from Madagascar may be differentiated from amber and other copal resins in reaching a peak in differential thermogravimetric analysis at 384 °C, while Colombian copal and amber from other localities peaks at 400 °C or more (Ragazzi et al., 2003). The age of copal resins may be only a few hundred to up to four million years old. Fig. 2. Distributional map of Ebenavia species. Colors follow Some resins from Madagascar have been dated using car- Hawlitschek et al. (2018). Additional localities for E. mainti- bon dating analyses to be as young as just a few decades mainty taken from Nussbaum and Raxworthy (1998). (Poinar, 1999; Bosselaers et al., 2010). Other estimates Bonn zoological Bulletin 67 (2): 71–77 ©ZFMK © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at Miniature gecko in resin 73 Fig. 3. Gecko in copal (Ebenavia boettgeri, ZFMK 94000) A. right lateral view, B. dorsal view; C. ventral view; D. left lateral view indicating the major bones. Abbreviations c#, cervical vertebrae #, l#, left toe #, r#, right toe #, t#, thoracic vertebrae #. for the age of Madagascan copal include a range from (amber yields a sooty odor). 2) Under a UV lamp the Holocene to Recent (10,000–100 y; Schlüter & Gnielins- piece did not show any color change (rather than emitting ki, 1987; Lourenço, 1996; Winkler et al., 2001). In this a bluish glow, as does amber). study, we confirmed that the specimen is embedded in Morphological comparisons considering members of copal based on the morphological similarities with mod- nearly all described gekkotan genera indicate that Ebe- ern species, and some simple tests on the resin: 1) A hot navia shares most morphological characters with ZFMK needle was pushed into the piece, causing rapid melting 94000. The genus occurs on Madagascar and satellite at the point of insertion (rather than slow melting expect- islands, Pemba Island, Grand Comoro, Mohéli, An- ed in amber); the melting resin released a mild fragrance jouan, Mayote, Nosy Bé, Nosy Komba, Île Sainte-Ma- Bonn zoological Bulletin 67 (2): 71–77 ©ZFMK © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/; www.zobodat.at 74 Juan D. Daza et al. Fig. 4. HRCT of the skulls of three geckos. Sphaerodactylidae: A. Sphaerodactylus semasiops (MCZ R-55766); Gekkonidae: B. Ebenavia boettgeri (ZFMK 94000), and C. Ebenavia boettgeri (CAS 66195). rie (Nosy Boraha), Nosy Mangabe, and Île aux Prunes E. robusta, E. safari, E. tuelinae; Hawlitschek et al., (Nosy Alañaña), as well as Mauritius (Ramanamanjato 2018, Fig. 2). Copal deposits in Madagascar are concen- et al., 2002; Hawlitschek et al., 2017, 2018; Uetz et al., trated in the northern part of the island (i.e., Cap D’Am- 2018). Until recently Ebenavia included only two species bre and the Sava Region, Geirnaert 2002), which is com- (E. maintimainty and E. inunguis). Ebenavia maintimain- patible with the distribution of E. safari and E. boettgeri ty has a restricted range, being found in Toliara Province (Hawlitschek et al., 2018). in southwestern Madagascar (Nussbaum & Raxworthy, The specimen is embedded in a cone-shaped piece of 1998), while the more widespread E. inunguis was re- orange resin (Fig. 1). The preservation is exceptional, cently split into four new species (viz., E.
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